Made launcher hidden when kicking off chrome in app mode.

ash/root_window_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/root_window_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_widget_controller.h"
@@ skipping 473 matching lines @@
   return status_area->system_tray();
 }
 
 void RootWindowController::ShowContextMenu(
     const gfx::Point& location_in_screen) {
   aura::RootWindow* target = Shell::IsLauncherPerDisplayEnabled() ?
       root_window() : Shell::GetPrimaryRootWindow();
   DCHECK(Shell::GetInstance()->delegate());
   scoped_ptr<ui::MenuModel> menu_model(
       Shell::GetInstance()->delegate()->CreateContextMenu(target));
+  if (!menu_model.get())
+    return;
 
   views::MenuModelAdapter menu_model_adapter(menu_model.get());
   views::MenuRunner menu_runner(menu_model_adapter.CreateMenu());
   views::Widget* widget =
       root_window_->GetProperty(kDesktopController)->widget();
 
   if (menu_runner.RunMenuAt(
           widget, NULL, gfx::Rect(location_in_screen, gfx::Size()),
           views::MenuItemView::TOPLEFT, views::MenuRunner::CONTEXT_MENU) ==
       views::MenuRunner::MENU_DELETED)
@@ skipping 187 matching lines @@
       "OverlayContainer",
       lock_screen_related_containers);
   SetUsesScreenCoordinates(overlay_container);
 
   CreateContainer(kShellWindowId_PowerButtonAnimationContainer,
                   "PowerButtonAnimationContainer", root_window) ;
 }
 
 }  // namespace internal
 }  // namespace ash